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Folders being converted to .exe files Win32/CRYPTOR

Hi,
I use Nokia N900 cell phone with a 16GB memory card. 3 days back, I connected it to a friend's laptop to take some movies. When I checked my phone sometimes later, the file manager was showing all my folders as folder.exe with a question mark (as the phone doesnt understand .exe). I understood that it has to be some infection, so I connected it to my PC at home and scanned with AVG 2012 free. It showed 40 infected files (all named as my previos folders.) I cleaned them but after cleaning, the folders were no more in my memory card, neither was my data. Well, most of it was songs and movies that I could make available somehow, the DCIM folder had camera pictures, and they were what I care most. I used PIRIFORM Recuva to scan the memory card. It gave me most of my pics, so no worry in that direction as well.
But, to avoid such thing happening again, how to clean such kind of infection without risk of losing the data?

Regardless of whether or not you have a malware infection, routinely backing up your data should be an important part of every computer users life. Whether it be a hard drive that has failed or malware that has caused your computer to become inoperable, not having your files, pictures, email, and music can be a disaster. We therefore suggest that before we move forward with this cleaning process, you first backup your data to a secure location. That secure location could be a burnable DVD, an external backup drive, or another computer. I have listed free backup software that you can use below:

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Thank you, boopme.
Well, Data may be backed up or may be recovered later.
My query is if a folder is converted to exe file due to infection, how can we reverse it? Or how can we remove infection so that the original folder is available again?